Like the title says, upgrading WordPress isn’t as difficult as you might think. As long as you don’t have a lot of “core upgrades” i.e. direct edits to WordPress core files, it shouldn’t take you more than a few minutes. In this tutorial I’ll show you how in 3-4 simple steps.
Take a full backup first
Get the latest version of WordPress
Overwrite core files
Run the database upgrade script (if necessary)
This tutorial will be going over everything manually. You can use things like Fantastico and those “automatic upgrade” scripts at your own risk. It may be a good idea to read this guide on installing WordPress first, but not necessary.